Charles harris



G. HARRIS. STEAMSHIP.

(No Model.)

' No. 491,170. Patented Feb .7, 1893.

INVENTOR mam: PETERS ca. mofuu'moq wunma'rou n c CHARLES HARRIS,BRIGHTON, ENGLAND.

STEAIVISHIP.

SPECIFICATION forming part of Letters Patent No. 491,170, dated February'7, 1893.

Application filed July 13, 1891. Serial No. 399,323. (No model.)'Patented in England March 3, 1891, No. 3,787.

To all whom it may concern.-

Be it known that 1, CHARLES HARRIS, a citizen of theUnitedKingdom ofGreatBritain and Ireland, residing at Brighton, in the countyof Sussex,England, have invented certain new and useful Improvements inSteamships; and I do declare the following to be a full, clear, andexact description of the invention, such as will enable others skilledin the art to which it appertains to make and use the same, referencebeing had to the accompanying drawings, and to the letters of referencemarked thereon, which form a part of this specification.

This invention has been patented to me in Great Britain, March 3, 1891,No. 3,787.

My invention relates to steamships, and its object is to improve thelines of the hull so as to diminish rolling, and obtain otheradvantages, as will hereinafter appear.

The invention consists in the construction and arrangement of the hullas hereinafter set forth and particularly pointed out in the claims.

Figure 1 is a longitudinal section. is a deck plan.

The drawings represent by Figs. 1 and 2 respectively the longitudinalsection and deck plan of a small vessel seventy six feet in length overall and twelve feet, six inches beam, with a molded depth of nine feet,having for the first improvement a central bulge, just above the Waterline designed to insure greater immunity from excessive rolling than isusually experienced in this class of steam ship.

Fig. 2

The principle upon which this line is ar rived at may be thusdescribed:Having laid down the outline of an ordinary deck plan, asindicated by the line A A, a start is made, in the bows, from the centerof the section 0 and also from the center of V astern: from these pointsare drawn two lines B B, segments of the arc of a circle whose radius isabout equal to the extreme length of the ship, which widen apart untilthey reach the maximum spread of the bulge previously determined upon bythe designer, in this case, one foot,six inches beyond the outside ofthe deck line amid. In the plan, the bulge is shown of an ovoidal, oregg-shaped form :--but if the sides of the vessel whereto this principleis being adapted run parallel with each other for any distance amid, itwill be advisable to let the bulge linefollow the same contour. Thestarting points of the bulge line may commence withinboard at any sitethe designer pleases, and may also extend from stem to stern ifpreferred. In the longitudinal section, the graduating level of thebulge line B B is shown, as it rises fore and aft with the lines of theship: this line therefore, where it intersects the vertical lines 0 D&c. to V, indicates the exact level of the maximum bulge at each andevery one of such vertical sections. It will be noted that the curve ofthe bulge on the longitudinal section follows a similar shape to thecurve on the plan, and this rule should obtain in all cases of shipbuilding on this principle. The designer, when planning this line willneed to have carefully before him the length, breadth and depth of hisvessel taken in conjunction with her estimated draft, because the lowestparts of the bulge amid, between K and 0, should always be just above,or at least about on a line with the water line.

This bulge line principle is, in its application, obviously capable ofmanifold varia-,

tions, affording wide scope for the taste and judgment of navalarchitects and engineers. This style of build will adapt itself in anespecial degree to double ended boats, having stem and stern alike.

The advantages claimed for this invention are:First. Diminished rollingby reason of (a) the central bulge acting as a counterbalancing weighton either side, and" (b) the increased stability caused by the cubicalfeet of displacement and the superficial area covered thereby being bothgreater than the cubical feet of the stowage or area contained in thesuperimposed space above.

Having thus described my invention, what I claim and desire to secure byLetters Patent is:

1. A steamship hull whose Walls extend continuously from keel tobulwarks, and have in each side an outwardly curving bulge, projectingbeyond the outline of the deck, said bulge being widest amidships andsheering from the waterline amidships to the level of the deck at stemand stern substantially as described.

2. A steam ship hull whose walls extend continuously from keel t0bulwarks and have in each side a bulge projecting beyond the outline ofthe deck on lines curved outward from stem and stern to a pointamidships, and sheering upwardly from said amidships point to the levelof the deck at stem and stern, substantially as described.

3. A steam ship hull Whose walls extend continuously from keel t0bulwarks its greatest beam being amidships on the water line, thegreatest breadth of the sections fore and aft of this point coincidingwith a curved line sheering from the Water line amidships t0 the levelof the deck at stem and stern, substantially as described.

In testimony whereof I'affix my signature in presence of two Witnesses.

CHARLES HARRIS. I

Witnesses:

CHRISTOPHER JOSEPH BEETON, 4:0 Devonshire Place, Brighton.

S. HARRISON,

24 O'heltenham Place, Brighton.

